Chassis, generic

C05E7 4WD/AWD Clutch B Actuator Control Circuit/Open

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modePossible

The AWD module finds no usable current path in its driver output for the clutch B actuator, most often an open coil, motor winding, connector or wire. A second clutch exists either in a twin-clutch rear drive unit with one clutch per rear wheel, or as a disconnect stage in the rear axle. Ford is the only maker with a public case: SSM 51117 lists C05E7:19 for 2021–2022 Bronco Sport 2.0L, the engine sold with the twin-clutch Badlands rear drive unit, while the single-clutch models in the same bulletin only log C0095. Ford traces it to a magnet ring that sits out of position inside the rear drive unit motor; the motor is now replaced on its own. Ford does not state which rear wheel belongs to B. Driver chips such as TI's DRV8873-Q1 test for an open load before switching on.

Likely causes

Open coil or motor winding in the clutch B actuator
Misaligned magnet ring in the rear drive unit motor (Ford Bronco Sport 2.0L)
Broken wire or corroded connector between AWD module and rear drive unit
Faulty driver stage in the AWD module

Symptoms

  • AWD warning lamp or message, rear axle no longer driven
  • Rear locking or torque vectoring function unavailable on twin-clutch units
  • Fault is present again immediately after clearing

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€100–1,500
Time0.5–4 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

awd clutch b actuatorawd control module

Related codes

C05E8C05E9C05EAC05D8

References: static.nhtsa.gov, ford.com, autoevolution.com, ti.com.